'Geany' no longer detects if there is an instance of itself already running, thus multiple instances are starting up, instead of files being opened in the current instance.

I doubt it is a "#ifdef HAVE_SOCKET" not being defined since the mutexs (called mutants in win32) are being created with the name 'Geany'.

I suspect it had to do with recent cleanups and changes in https://github.com/geany/geany/commits/c5b0fc459a1251c824a44edb5dfab4a8feb0bd00/src/socket.c

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